Search warrants outline investigators' early efforts to track Dorner

Search warrants detail investigators' attempts to prove Christopher Jordan Dorner was responsible for the killings of an Irvine couple.

Dorner, who died Tuesday at the end of a firefight with law enforcement in the Barton Flats area of the San Bernardino mountains, is also believed to have killed Riverside police officer Michael Crain and San Bernardino County Sheriff's deputy Jeremiah MacKay.

According to a search warrant issued February 6 by Judge James Stotler in Orange County and executed Feb. 8, police were given the authority to search Dorner's La Palma residence, for evidence to connect him to the killings of Keith Lawrence and Monica Quan.

Among the property they listed to be seized were plans, maps, diaries and journals of plans to kill the couple, personal identifying information about the two victims, as well as other members of the Quan family. Police were also to seize any information about the Irvine residence and surrounding garages where Lawrence and Quan lived.

The police also were to seize handguns and and instruments connected to the crime, laptops and electronic storage devices and any files or documents within. Also to be seized were buccal swabs of DNA.

Police also interviewed Jason Young who managed a Nevada restaurant Dorner frequented. According to police, Young said he and Dorner struck up a friendship because of a shared interest in firearms.

Young told police Dorner had many high-powered rifles and tactical firearms accessories. The restaurant manager later e-mailed photos he had received from Dorner of firearms, weapon sights, silencers and high capacity magazines that Dorner said he intended to sell on line on the website www.backpage.com.

Police also requested a search warrant of the business for all accounts associated with Dorner.

Police also searched Facebook for all its information attributed to Dorner's personal account, including his profile page, friends list, groups and networks to which he was a member and communications between Facebook and anyone regarding the user or her account. Police also asked for an order barring Facebook from revealing the existence of the search warrant.